1000043431001 has 4 divisors (see below), whose sum is σ = 1000539240372. Its totient is φ = 999547621632.

The previous prime is 1000043430983. The next prime is 1000043431003. The reversal of 1000043431001 is 1001343400001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 345156250000 + 654887181001 = 587500^2 + 809251^2 .

It is a cyclic number.

It is not a de Polignac number, because 1000043431001 - 2²² = 1000039236697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1000043431003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 247901660 + ... + 247905693.

It is an arithmetic number, because the mean of its divisors is an integer number (250134810093).

Almost surely, 2^{1000043431001} is an apocalyptic number.

It is an amenable number.

1000043431001 is a deficient number, since it is larger than the sum of its proper divisors (495809371).

1000043431001 is an equidigital number, since it uses as much as digits as its factorization.

1000043431001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495809370.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 1000043431001 its reverse (1001343400001), we get a palindrome (2001386831002).

The spelling of 1000043431001 in words is "one trillion, forty-three million, four hundred thirty-one thousand, one".